Add mechanism to restore the removed storage directories
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Key: HDFS-3075
URL: https://issues.apache.org/jira/browse/HDFS-3075
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.24.0, 1.1.0
Reporter: Brandon Li
Assignee: Brandon Li
When a storage directory is inaccessible, namenode removes it from the valid storage dir list
to a removedStorageDirs list. Those storage directories will not be restored when they become
healthy again.
The proposed solution is to restore the previous failed directories at the beginning of checkpointing,
say, rollEdits, by copying necessary metadata files from healthy directory to unhealthy ones.
In this way, whenever a failed storage directory is recovered by the administrator, he/she
can immediately force a checkpointing to restored a failed directory.
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